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HVAC Star Practice Exam

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A lamp source has a voltage of 110 volts and a current of 0.9 amperes. What is the resistance of the lamp?
Correct Answer:
122.2 ohms
Explanation:
Resistance is found by dividing the voltage across an element by the current through it. For this lamp, R = V / I = 110 V / 0.9 A = 122.222... ohms, which rounds to 122.2 ohms. This is the correct value because it directly applies Ohm’s law (resistance = voltage divided by current). Multiplying voltage by current would give power, not resistance, so that path wouldn’t yield the right result.

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